Re: [PHP] if(isset($a)) vs if($a)
In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Mark) wrote: if(isset($) and !empty($a) and !$a) this is the same as if(!empty($a)) or if(isset($) and $a===FALSE) this is the same as if(empty($a)) (Aside from accidentally omitted the a in the var name...oops...) No, they're not the same thing if you have error reporting set to E_ALL. If $a is not set, calling empty($a) or !$a produces a warning. -- CC -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] if(isset($a)) vs if($a)
On Sun, 16 Sep 2001 09:18:23 -0700, CC Zona wrote: In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Mark) wrote: if(isset($) and !empty($a) and !$a) this is the same as if(!empty($a)) or if(isset($) and $a===FALSE) this is the same as if(empty($a)) Aside from accidentally omitted the a in the var name...oops...) No, they're not the same thing if you have error reporting set to E_ALL. If $a is not set, calling empty($a) or !$a produces a warning. calling empty($a) does not give a warning. -- Mark, [EMAIL PROTECTED] on 09/16/2001 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] if(isset($a)) vs if($a)
In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Mark) wrote: calling empty($a) does not give a warning. Sheesh. It doesn't at that. WTF? -- CC -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] if(isset($a)) vs if($a)
In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Andrew Perevodchik) wrote: JD isset checks to see if the $a variable has JD been set, ie, if it exists. if($a) checks for JD the truthood of $a, meaning, if it has a JD non-zero, non-null/empty-string value, then JD its true, else, false. ... and if it's not set at all it returns a warning unless you use @ :( Or change the error_reporting level, or turn off display_errors (okay, technically the warning is still happening in the latter case, but IIRC that's also true of @--both simply suppress the *reporting* of the report rather than the *occurance* of the error). This is why it's best to do multiple checks and choose them carefully. Ex: if(isset($) and !empty($a) and !$a) or if(isset($) and $a===FALSE) etc. -- CC -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] if(isset($a)) vs if($a)
On Sat, 15 Sep 2001 13:20:59 -0700, CC Zona wrote: In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Andrew Perevodchik) wrote: JD isset checks to see if the $a variable has JD been set, ie, if it exists. if($a) checks for JD the truthood of $a, meaning, if it has a JD non-zero, non-null/empty-string value, then JD its true, else, false. ... and if it's not set at all it returns a warning unless you use @ :( Or change the error_reporting level, or turn off display_errors (okay, technically the warning is still happening in the latter case, but IIRC that's also true of @--both simply suppress the *reporting* of the report rather than the *occurance* of the error). This is why it's best to do multiple checks and choose them carefully. Ex: if(isset($) and !empty($a) and !$a) this is the same as if(!empty($a)) or if(isset($) and $a===FALSE) this is the same as if(empty($a)) -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP] if(isset($a)) vs if($a)
isset checks to see if the $a variable has been set, ie, if it exists. if($a) checks for the truthood of $a, meaning, if it has a non-zero, non-null/empty-string value, then its true, else, false. jack -Original Message- From: David Yee [mailto:[EMAIL PROTECTED]] Sent: Friday, September 14, 2001 6:04 PM To: [EMAIL PROTECTED] Subject: [PHP] if(isset($a)) vs if($a) Hi. What is the difference between: if(isset($a)) and if($a) ??? Thanks. David -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
